Plugin Dependency issues in build.gradle and Plugin Repository Browsing

I'm developing a plugin which depends on another third-party plugin, and I'm having trouble adding it as a dependency in build.gradle. I'm able to add the dependency to plugin.xml, but I've been having lots of issues getting the sandbox to run with the plugin (currently, I have to launch the sandbox, download the plugin, and restart the sandbox, but the dependency is lost each time I edit my code and rebuild). I can navigate to the plugin's Jetbrains page, and I can download it using the plugin window in IntelliJ, but it will not cooperate with build.gradle. I can also navigate to the plugin's pom file, which makes me wonder if this is a repository issue.

The Gradle import error is shown below:

Could not find com.millennialmedia.intellibot.jar (com.jetbrains.plugins:com.millennialmedia.intellibot:0.10.143.381).
Searched in the following locations:
https://cache-redirector.jetbrains.com/plugins.jetbrains.com/maven/com/jetbrains/plugins/com.millennialmedia.intellibot/0.10.143.381/com.millennialmedia.intellibot-0.10.143.381.jar

My build.gradle statement is shown below:

plugins = ["coverage", "com.millennialmedia.intellibot:0.10.143.381"]

I've also been wondering if there's a way to browse the plugin repository similar to how the maven repository can be browsed (example). It would be very useful for issues like the one I'm facing. https://plugins.jetbrains.com is useful, but there seems to be some disconnect between what we see there and the true state of the repository.